MB39A125 Datasheet, PDF (45/64 Pages) Fujitsu Component Limited. – DC/DC Converter IC for Charging Li-ion Battery

MB39A125/126
■ APPLICATION EXAMPLE 1
• MB39A125
VIN
(8 V to
25 V)
IIN
Q2
R14
15 kΩ
R17
51
kΩ
R18
RS1
0.015
Ω
24
kΩ
R15
68 kΩ
R16
10 kΩ
ACIN
7
ACOK
5
XACOK
18
R12
30 kΩ
R13
20
kΩ
R9
36 kΩ
−INE1
C8
6800 pF
R5
8
100 kΩ
R6
10 kΩ
10
OUTC1
A ^{+INC1 13}
B
12
−INC1
R11
1.1
kΩ
SW2
C10
6800
pF
R7
10 kΩ
+INE1
9
−INE2
R8 ⁴
100 kΩ
2
OUTC2
+INC2 ²⁴
−INC2 ¹
R10
20 kΩ
+INE2 ³
C13
22 pF
R3
FB123 ₁₅
33
R21
kΩ
100 kΩ
R22
200 kΩ
−INE3 ₁₆
C6 C14
2200 pF 47 pF
R23
100 kΩ
11
OUTD
<Current Amp 1>
VREF
+
<Error Amp 1>
×−20
−
+
<Current Amp 2>
<Error Amp 2>
−
+
−ײ⁰
+
<Error Amp 3>
−
+
4.2 V
<AC Comp.>
+
−
0.2 V <UV Comp.>
+
−
−INC1
(Vo)
<PWM Comp.>
+
−
<OUT>
Drive
VCC
21
C12 C7
0.1
µF _0.1
µF
20
OUT
−2.5 V
−1.5 V
VH
19
VH
(VCC −
6 V)
Bias
Voltage
<UVLO>
VREF
UVLO
to System
C15
0.22 µF
R20
56 kΩ
R19 ^{100 kΩ}
Q3
C1
10 µF
Q1
L1
15 µH
D1
C3
10 µF
AB
ICHG
RS2
0.033
Ω
C4
10 µF
Battery
C11
0.22 µF
VREF ^<SOFT>
CS
22
10 µF
Slope
Control
<OSC>
500 kHz Max
4.2 V
Bias
VCC
<REF> <CTL>
RT ¹⁷
R4
47 kΩ
CT
(45 pF)
VREF
5.0 V
VREF ⁶
GND ²³
C9
0.22
µF
CTL
14
45